Air cushion



FIG. 1 is a perspective view of an air cushion;

FIG. 2 is a front view of the air cushion of FIG. 1;

FIG. 3 is a back view of the air cushion of FIG. 1;

FIG. 4 is a left view of the air cushion of FIG. 1;

FIG. 5 is a right view of the air cushion of FIG. 1;

FIG. 6 is a top view of the air cushion of FIG. 1; and,

FIG. 7 is a bottom view of the air cushion of FIG. 1.

The broken lines are for illustrative purposes and form no part of the present invention. 

CLAIM The ornamental design for an air cushion, as shown and described. 